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Baltisphaeridium pilosum

Baltisphaeridium pilosum, (Ehrenberg, 1854), Sarjeant, 1961

Now Barbatacysta. Originally Xanthidium (an extant desmid genus), subsequently Hystrichosphaera, thirdly Hystrichosphaeridium, fourthly Baltisphaeridium, fifthly Tenua, sixthly Sentusidinium, seventhly Batiacasphaera, eighthly (and now) Barbatacysta; see also Cleistosphaeridium (combination not validly published).

Holotype: Ehrenberg, 1854, pl.37, fig.8, no.4
Age: Oxfordian
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